fdt_map_range
md_start = fdt_map_range(initrd_start, initrd_end, &initrd_size,
rndseed = fdt_map_range(rndseed_start, rndseed_end, &rndseed_size,
efirng = fdt_map_range(efirng_start, efirng_end, &efirng_size,